Moving bed pulverized coal pyrolysis and fluidized bed coke powder gasification coupled device and coupling method thereof

Abstract

The invention discloses a moving bed pulverized coal pyrolysis and fluidized bed coke powder gasification coupled device and a coupling method thereof. The device comprises a moving bed pulverized coal pyrolysis furnace and a fluidized bed coke powder gasification furnace which is connected with the moving bed pulverized coal pyrolysis furnace, wherein the moving bed pulverized coal pyrolysis furnace is communicated with the inlet of the fluidized bed coke powder gasification furnace through a low pipe, and is connected with a high-temperature deep deduster; coke powder dedusted by the high-temperature deep deduster is discharged from the lower end of the high-temperature deep deduster; dedusted pyrolysis coal gas and tar vapor enter a gas cooler to be cooled; and the condensed tar and water enter a separator, tar is separated, the coal gas from the gas cooler passes through a static tar removing device for further removal of tar, and finally the coal gas enters a purification system. In the invention, high-temperature coal gas in the fluidized bed coke powder gasification furnace is used as a carrier, pulverized coal is subjected to low-temperature pyrolysis in the moving bed pulverized coal pyrolysis furnace to release volatile matters for producing coal gas and tar, the coke powder obtained after pyrolysis is returned to the fluidized bed coke powder gasification furnace to be gasified into coal gas, and thus, the combined production of coal gas, semicoke and tar is realized.

Description

Technical field [0001] The invention relates to a pyrolysis and gasification coupling device and method, in particular to a moving bed pulverized coal pyrolysis and fluidized bed pulverized coke gasification coupling device and method. Background technique [0002] With the rapid development of the national economy, my country's oil consumption has increased rapidly, and my country is a country relatively lacking in oil resources. In order to reduce dependence on imported oil, my country is implementing a diversified energy strategy. The development of pulverized coal pyrolysis technology is one of the national energy diversification strategies. Pulverized coal pyrolysis technology is a clean coal technology with very good competitiveness due to its relatively simple method and low investment. [0003] Typical coal pyrolysis processes at home and abroad include: external heating vertical furnace process, internal heating vertical furnace process, American Garrett process and TOSCO...

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Problems solved by technology

Among them, the internal heating type low-temperature (lump coal) carbonization process adopted in China uses air as a combustion aid, and the gas contains a large amount of nitrogen, which greatly reduces the calorifi...

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